Also, split getReactions() API into two calls
* getTriggerReactions() - lists all reactions that can be triggered with MyAvatar.triggerReaction().
* getBeginReactions() - lists all reactions that can be used with MyAvatar.beginReaction() and MyAvatar.endReaction().
This PR disables handTouch.js.
handTouch.js allows the fingers to animate on the surface of an object.
However, it can sometimes detect collisions with walls or tables when the avatar is standing next to them.
We will more properly fix handTouch.js in a future PR, but for now we will disable the functionality.
Also, a small bug fix was made to the Rig to prevent the idleOverlayAlpha from exceeding the 0.0 to 1.0 range.
This can cause the fingers to bend incorrectly for a moment.
Also, three new items were added to the Developer > Show Animation Stats panel.
* Joint Override Count: displays the current count of joints that are overriden by MyAvatar.setJointRotation() JS API calls.
* Flow: displays if flow is active of disabled.
* Network Graph: displays if the network anim graph, used for teleportation, is enabled or disabled.
https://highfidelity.atlassian.net/browse/BUGZ-154
This feature was added to help diagnose the root cause of a rarely occurring finger twitching bug.
Also, some asserts were added to AnimClip to also help catch a rarely occurring crash.
* cameraInsideHead() check now uses detailed avatar collision when possible.
* head is now more constantly hidden in first person camera mode
* getEyeModelPositions() uses a better estimate when avatar eye joints are missing.
* moved findPointKDopDisplacement from Rig.cpp into AnimUtil.cpp
* added isPlayingOverrideAnimation() method to Rig class
This allows avatars to have scale on their joints without being clobbered by animations.
Renamed variables for easier maintenance.
Also small optimization when no ikNode is present.
